LC-X1228P Panasonic - BSG, LC-X1228P Datasheet

BATT SEALED LEAD ACID 12V 28AH

LC-X1228P

Manufacturer Part Number
LC-X1228P
Description
BATT SEALED LEAD ACID 12V 28AH
Manufacturer
Panasonic - BSG
Series
LCr
Datasheet

Specifications of LC-X1228P

Voltage - Rated
12V
Capacity
28Ah
Size / Dimension
6.47" L x 4.92" W x 6.89" H (165mm x 125mm x 175mm)
Termination Style
Nut/Bolt, M5
Rechargeability
Yes
Weight
25 lbs (11.3kg)
For Use With
BVW122250003N - BATTERY CHG UNIV 12VDC @ 2.25A271-2390 - BATTERY CHG UNIV 12VDC @ 2.25A271-2386 - BATTERY CHG UNIV 12VDC @ 1.2A271-2385 - BATTERY CHG UNIV 12VDC @ 600MA271-2382 - BATTERY CHG UNIV 12VDC @ 500MA271-2381 - BATTERY CHG UNIV 12VDC @ 500MA271-2380 - BATTERY CHG 120VAC 12VDC @ 500MA271-2378 - BATTERY CHG 120VAC 12VDC @ 300MAPATC-08 - BATT CHARGER 12V 1.5A X 2 UNITPATC-03 - BATTERY CHARGER 12 VOLT 1.5 AMP
Lead Free Status / RoHS Status
Contains lead / RoHS compliant by exemption
Other names
LC-X1228
LC-XB1228
LC-XB1228P
LCX1228P
P049
Valve-Regulated Lead Acid Batteries
Technical Handbook ‘03/‘04
PDF File Technical Handbook
Copyright 2003 Matsushita Battery Industrial Co., Ltd. All rights Reserved. No part of this technical
handbook pdf file may be changed, altered, reproduced in any form or by any means without the
prior written permission of Matsushita Battery Industrial Co., Ltd.
NOTICE TO READERS
It is the responsibility of each user to ensure that each battery application system is adequately
designed safe and compatible with all conditions encountered during use, and in conformance
with existing standards and requirements. Any circuits contained herein are illustrative only
and each user must ensure that each circuit is safe and otherwise completely appropriate for
the desired application.
This literature contains information concerning cells and batteries manufactured by Matsushita
Battery Industrial Co., Ltd. This information is generally descriptive only and is not intended to
make or imply any representation guarantee or warranty with respect to any cells and batteries.
Cell and battery designs are subject to modification without notice. All descriptions and
warranties are solely as contained in formal offers to sell or quotations made by Matsushita
Battery Industrial Co., Ltd., Panasonic Sales Companies and Panasonic Agencies.

Related parts for LC-X1228P

LC-X1228P Summary of contents

Page 1

... Valve-Regulated Lead Acid Batteries Technical Handbook ‘03/‘04 PDF File Technical Handbook Copyright 2003 Matsushita Battery Industrial Co., Ltd. All rights Reserved. No part of this technical handbook pdf file may be changed, altered, reproduced in any form or by any means without the prior written permission of Matsushita Battery Industrial Co., Ltd. ...

Page 2

... Battery Selection Tables Main and Standby Power Applications ................................ 30 Standby Power Applications (Trickle Long Life Type) ....... 31 Main Power Applications (Cycle Long Life Type) ............... 32 Valve-Regulated Lead Acid Batteries: Individual Data Sheets .... 33 Terminal Dimensions ........................................................................ 58 Examples of Battery Labels ............................................................. 59 SAV-LEAD Recycling Program .......................................................... 60 Glossary of Terms for Valve-Regulated Lead-Acid Batteries ....... 62 (notes) 1 ...

Page 3

PRECAUTIONS FOR HANDLING VALVE-REGULATED LEAD-ACID BATTERIES Precautions for handling Valve-Regulated Lead-Acid Batteries • This document should be read in its entirety and its contents fully understood before handling or using Panasonic rechargeable Valve-Regulated Lead-Acid batteries. If there are any questions, ...

Page 4

PRECAUTIONS FOR HANDLING VALVE-REGULATED LEAD-ACID BATTERIES Safety Precautions 1. Environment and condition of use DANGER (1) Do not load valve-regulated lead-acid batteries (hereinafter described as “the battery”) in airtight equipment. Use of the battery in airtight equipment may cause explosion ...

Page 5

PRECAUTIONS FOR HANDLING VALVE-REGULATED LEAD-ACID BATTERIES- (6) In applications which use more than one battery, first make sure of correct mutual connections between batteries, and then connect the battery with the charger or the load. Make sure to firmly connect ...

Page 6

PRECAUTIONS FOR HANDLING VALVE-REGULATED LEAD-ACID BATTERIES- (Vertical position) (Horizontal position) (3) Do not carry the battery by hanging it from the terminal or the lead wire may cause damage to the battery. (4) When carrying the battery, exercise ...

Page 7

... Multiply this by the rated capacity (at 20 hour rate) of the battery Regardless of the above calculation, the charge time for a refresh charge must be less than 12 hours. When the storage ambient temperature is higher than 25 C, please consult Panasonic. ...

Page 8

PRECAUTIONS FOR HANDLING VALVE-REGULATED LEAD-ACID BATTERIES- 5. Method of use DANGER (1) The batteries must be charged using the specified charger or by maintaining the charging conditions indicated by Panasonic. If the batteries are charged under conditions other than those ...

Page 9

PRECAUTIONS FOR HANDLING VALVE-REGULATED LEAD-ACID BATTERIES- RECOMMENDATION (1) The recommended cut-off voltage during discharge depends on the size of the discharge current. The relationship between the storage battery discharge current and the ideal discharge cut-off voltage is described in Panasonic ...

Page 10

PRECAUTIONS FOR HANDLING VALVE-REGULATED LEAD-ACID BATTERIES- 6. Maintenance and checking WARNING (1) Clean the battery with a slightly damp cloth, ensure there is no excess water on the cloth by squeezing it well. Do not use a dry cloth or ...

Page 11

... Examples of places that accept these batteries are: County or municipal recycling drop-off centers, scrap metal dealers, and retailers sho sell automotive replacement lead acid starter batteries. In North America, non-consumers can call 1-800-SAV- LEAD for assistance in recycling. Refer to the SAV-LEAD section in the back of this handbook for complete instructions ...

Page 12

... The VRLA battery is a rechargeable battery which does not require adding water. Based on AGM (Absorbed Glass Mat) technology with calcium grids, the batteries offer excellent high rate performance characteristics and increased life expectancy. Battery Types and model numbers ...

Page 13

... Negative plates Negative plates are plate electrodes of which a grid frame of lead-tin-calcium alloy holds spongy lead as the active material. Electrolyte Diluted sulfuric acid is used as the medium for conducting ions in the electrochemical reaction in the battery ...

Page 14

GENERAL INFORMATION ON VALVE-REGULATED LEAD-ACID BATTERIES - Electrochemical Reactions on Electrodes The electrochemical reaction processes of the valve-regulated lead-acid battery (negative electrode recombination type) are described below. Where “charge” is the operation of supplying the rechargeable battery with direct current ...

Page 15

... Long service life Service life of our long-life series (LC-P, LC-X series) is approximately double that of the conventional LC-R series batteries (Temperature 25°C, discharge rate 0.25 CA/ 1.75V/cell, discharge frequency every 6 months, 2 ...

Page 16

... GENERAL INFORMATION ON VALVE-REGULATED LEAD-ACID BATTERIES - Example of rechargability after deep discharge and standing 2.0 Current product LC-RA064R2P Conventional type (6V4.2Ah) (6V4Ah) 1.6 1.2 0.8 0.4 0 Charge time (hours) Transportation All of our lead acid batteries are unregulated by DOT for transportation by truck, rail, ocean and air trans- portation because they meet the requirements of 49 CFR 173 ...

Page 17

CHARACTERISTICS Charging Charge characteristics (constant voltage-constant current charging) of VRLA batteries are exemplified below. Example of constant-voltage charge characteristics by current (V/cell) 2.5 2 (Test condition) Discharge : 0.05 CA constant- current discharge 0.4 Cut-off voltage; 1.75 V/cell ...

Page 18

CHARACTERISTICS - CONTINUED d) Discharge current Discharge capability of batteries is expressed by the 20 hour rate (rated capacity). Select the battery for specific equipment so that the discharge current during use of the equipment falls within the range between ...

Page 19

CHARACTERISTICS - CONTINUED e) Open circuit voltage vs. residual capacity Residual capacity of the battery can be roughly estimated by measuring the open circuit voltage as shown in the Figure. Open circuit voltage vs. Residual capacity 77°F (25°C) 7.00 (Temperature: ...

Page 20

... Discharge frequency : once every 21 days 200 150 100 Conventional products 50˚C discharge period (months Conversion to 25˚C period (years Conversion to 20˚C period (cycles) Trickle (Float) life characteristics (LC-R and LC-L) 120 100 Trickle long life series VRLA BATTERIES PAGE 19 (Test condition) Discharge : 0.25 CA Cut-off voltage : 1 ...

Page 21

CHARGING METHODS Methods of Charging the Valve-Regulated Lead-Acid Battery For charging the valve-regulated lead-acid battery, a well-matched charger should be used because the capacity or life of the battery is influenced by ambient temperature, charge voltage and other parameters. (1) ...

Page 22

CHARGING METHODS - CONTINUED (2) Stand-by/Back-up use The application load is supplied with power from AC sources in normal state. Stand-by/back-up use is to maintain the battery system at all times so that it can supply power to the load ...

Page 23

CHARGING METHODS - CONTINUED Float charge Float system is the system in which the battery and the load are connected in parallel to the rectifier, which should supply a constant-voltage current. Float charge system model the ...

Page 24

CHARGING METHODS - CONTINUED Charging Considerations a) Temperature compensation of charge voltage Charge voltage should be compensated to the ambient temperature near the battery, as shown by the figure below. Main reasons for the tempera- ture compensation of charge voltage ...

Page 25

CHARGING METHODS - CONTINUED Characteristics of constant voltage chargers Even with the same voltage set-up, charging time varies with output V-I characteristics. Output V-I characteristics of the constant voltage charger vs. Charging pattern of the battery I I Precautions 1) ...

Page 26

SAFETY VRLA battery ( smaller capacity) safety test items Item A fully charged battery is allowed to drop in the upright position from the height onto a hard 1. Shock test board having a ...

Page 27

... Corresponding model number descriptions are listed below. Please refer to the battery indexes for listings of available models. No Product codes: “LC” indicates Panasonic Sealed Lead-Acid batteries; “UP” indicates High Power Series. No. 4: Fixed single-figure code (alphabetic letter) indicating properties, shape, etc. of the battery R : Small-sized VRLA products (under 33Ah Optional flame-retardant case for “ ...

Page 28

... Index” on page 31 to 33. LC-XC1238AP 200 300 500 (mA) Discharge current UP-RW1220P LC-R063R4P LC-R123R4P LC-R122R2P 100 200 300 500 1 2 (mA) Discharge current VRLA BATTERIES PAGE 27 <Temperature 25˚C> LC-XC1228AP (A) LC-X1228AP <Temperature 25˚C> LC-X1228P LC-RD1217P LC-R0612P LC-RA1212P LC-R067R2P LC-R127R2P LC-P067R2P LC-P127R2P UP-RW1245P1 (A) AUGUST 2003 ...

Page 29

... BATTERY SELECTION CHART - CONTINUED (4) Example Use condition: 2.9 A, 1.5 hours space allowable 100 mm x 160 mm x 105 mm 7 selected in the step (3). LC-R127R2P 151 mm x 100 mm is selected in the step (4). VRLA battery for standby power applications ( Ah 1 300 VRLA battery for standby power applications (100 Ah) ...

Page 30

BATTERY SELECTION GUIDE Steps for selecting batteries are described below. • Study of required specifications (draft) Study the required specifications (draft) by checking Technical requirements for battery selection Electrical requirement Voltage range Cycle charge Vmax. Vmin. Trickle/Float Continuous load charge ...

Page 31

... BATTERY INDEX FOR MAIN AND STANDBY POWER APPLICATIONS Standard Type Expected trickle life approx. 3 years…LC-R, LC-L series Model Nominal Rated capacity Number Voltage (Ah) (V) (20 hour rate) LC-R061R3P 6 1.3 LC-R121R3P 12 1.3 LC-R122R2P 12 2.2 LC-R123R4P 12 3.4 LC-R063R4P 6 3.4 LC-RA064R2P 6 4.2 LC-R067R2P 6 7.2 ...

Page 32

... LC-P067R2P 6 LC-P127R2P 12 7.2 LC-P0612P 6 12.0 LC-PD1217P 12 17.0 LC-X1220P 12 20.0 20.0 LC-X1220AP 12 LC-X1228P 12 28.0 LC-X1228AP 12 28.0 LC-X1242P 12 42.0 LC-X1242AP 12 42.0 LC-X1265P 12 65.0 LC-XA12100P 12 100.0 Notes: • If used cyclically, so that the battery is repeatedly only partially discharged (by less than 30% of its rated capacity) and then recharged, the battery life may be drastically shortened, depending on the discharging conditions ...

Page 33

... Features • Much longer cycle life Conventional Cycle long life type Expected trickle life (years) Terminal types --- --- M5 threaded Post --- --- M5 threaded Post ° C (LC-XC1228AP (Test conditions) 40 Discharge: 7.0A (0.25CA) Cut-off voltage: 10.5V Charge: 14.7V 20 Maximum current: 11.2A 12 hours Temp.: 25˚ 100 200 ...

Page 34

... LC-R061R3P 3.9 1.3Ah Duration of discharge vs. Discharge current 1.2Ah 1.05Ah 0.85Ah 0.6A Approx. 50m 102% 100% 85% 65% 91% ...

Page 35

... LC-R121R3P 1.3Ah Duration of discharge vs. Discharge current 1.2Ah 1.05Ah 0.85Ah 0.6A Approx. 90m 102% 100% 85% 65% 91% 82% 64% ...

Page 36

... VALVE-REGULATED LEAD ACID BATTERIES: INDIVIDUAL DATA SHEET LC-R122R2P Photo/Label for reference only. Specifications Characteristics ° ° ° ° ° ° ° ° ° ( ° ° ° ° ° (Note) The above characteristics data are average values obtained within three charge/discharge. Cycles not the minimum values. ...

Page 37

... For main and standby power supplies. Expected trickle life: 3-5 years at 25°C, Approx. 5 years at 20°C. Dimensions (mm) Discharge characteristics 77°F (25°C) 12V 3.4Ah 5.276 inches (134.0 mm) 2.638 inches (67.0 mm) 2.362 inches (60.0 mm) 2.598 inches (66.0 mm) 2.65 lbs. (1.20 kg) LC-R123R4P Duration of discharge vs. Discharge current 0 ...

Page 38

... LC-R063R4P 3.9 Duration of discharge vs. Discharge current 3.4Ah 3Ah 2.7Ah 2.1Ah 1.5A Approx. 30m 102% 100% 85% 65% 91% ...

Page 39

... Approx. 1.72 lbs. (0.78kg) 3.9 0 LC-RA064R2P Duration of discharge vs. Discharge current 30 4.2Ah 20 3.9Ah 15 3.5Ah 10 2.8Ah 2. Approx. 20m 3 102% 2 100% 1 ...

Page 40

... LC-R067R2P 4.5 4.0 LC-R067R2P1 3.5 3.0 LC-R067R2P2 2.5 Duration of discharge vs. Discharge current 7.2Ah 6.8Ah 6.3Ah 4.9Ah 3.5A Approx. 20m 102% 100% 85% 65% 91% 82% 64% 2 ...

Page 41

... LC-P067R2P1 3.0 2.5 LC-P067R2P Duration of discharge vs. Discharge current 7.2Ah 30 6.8Ah 6.3Ah 20 15 4.9Ah 10 3.5A Approx. 20m 5 4 102% 3 ...

Page 42

... Discharge characteristics 77°F (25°C) 2.539 inches (64.5 mm) 3.702 inches (94.0 mm) 15.0 14.0 3.937 inches (100.0 mm) 13.0 5.45 lbs. (2.47 kg) 12.0 11.0 LC-R127R2P 10.0 LC-R127R2P1 7.2Ah 6.8Ah 6.3Ah Duration of discharge vs. Discharge current 4.9Ah 30 3. Approx. 40m 10 102% 100% ...

Page 43

... LC-P127R2P1 8.0 7.0 LC-P127R2P 6.0 5.0 Duration of discharge vs. Discharge current 7.2Ah 30 6.8Ah 6.3Ah 20 4.9Ah 15 10 3.5A Approx. 40m 5 4 ...

Page 44

... LC-R0612P 5.1 4.8 LC-R0612P1 4.5 4.2 3.9 12Ah Duration of discharge vs. Discharge current 11.3Ah 10.4Ah 30 8.1Ah 20 5. Approx. 15m 102% ...

Page 45

... LC-P0612P1 4.5 4.2 LC-P0612P 3.9 Duration of discharge vs. Discharge current 12Ah 30 11.3Ah 20 10.4Ah 15 8.1Ah 10 5.8A 5 Approx. 15m 4 3 102% ...

Page 46

... Discharge characteristics 77°F (25°C) 3.860 inches (98.0 mm) 3.702 inches (94.0 mm) 14.4 3.937 inches (100.0 mm) 13.8 13.2 8.36 lbs. (3.8 kg) 12.6 12.0 LC-RA1212P 11.4 10.8 LC-RA1212P1 10.2 9.6 9.0 8.4 7.8 12Ah 11.3Ah 10.4Ah Duration of discharge vs. Discharge current 8.1Ah 5. Approx ...

Page 47

... ° VRLA BATTERIES PAGE 46 Terminal type: LC-RD1217P: M5 bolt and nut 2.992±0.079 (76±2) 7.126±0.079 (181±2) 0.886 (22) 0.443 (11) 0.197 (5) 4.429 (112.5) 0.197 (5) 7.067 (179.5) 2.933 (74.5) Battery case resin: Standard (UL94HB) Color is black. 14.4 13.8 13.2 12.6 12.0 11.4 10.8 10 ...

Page 48

... A or smaller 14.5V to 14.9V (per 12V cell 25˚C) 2. smaller 13.6V to 13.8V (per 12V cell 25˚ Terminal type: LC-PD1217P: M5 bolt and nut 2.992±0.079 (76±2) 7.126±0.079 (181±2) 0.886 (22) 0.443 (11) 0.197 (5) 4.429 (112.5) 0.197 (5) 7.067 (179.5) 2.933 (74.5) Battery case resin: Standard (UL94V-0) Color is grey. ...

Page 49

... Discharge characteristics 77°F (25°C) 5.118 inches (130.0 mm) 6.102 inches (155.0 mm) 14.4 13.8 7.087 inches (180.0 mm) 13.2 26.5 (12.0 kg) 12.6 12.0 LC-R1233P 11.4 10.8 LC-V1233P 10.2 9.6 9.0 8.4 7.8 33Ah 30Ah 27Ah 20Ah Duration of discharge vs. Discharge current 13.4A 30 Approx. 7m ...

Page 50

... A or smaller 20 14 14.9 V (per 12V cell 25˚ smaller 13.6V to 13.8V (per 12V cell 25˚C) VRLA BATTERIES PAGE 49 Terminal type: LC-X1220P: M5 bolt and nut LC-X1220AP: M5 threaded post 2.992±0.079 (76±2) 0.886 (22) 7.126±0.079 (181±2) 0.197 (5) 0.443 (11) 0.197 (5) 4.429 (112.5) 2.933 (74.5) 7 ...

Page 51

... A or smaller 5 13.6V to 13.8V (per 12V cell 25˚ VRLA BATTERIES PAGE 50 Terminal type: LC-X1228AP: M5 threaded post LC-X1228P: M5 bolt and nut 6.496±0.079 (165±2) 4.921±0.079 (125±2) 5.28 (134) 0.47 (12) 3.54 (90) 6.43 (163.4) 4.88 (124) Battery case resin: Standard (UL94HB) Color is black. ...

Page 52

... A or smaller 14.5V to 14.9V (per 12V cell 25˚C) VRLA BATTERIES PAGE 51 Terminal type: LC-XC1228AP: M5 threaded post + 6.496±0.079 (165±2) 4.921±0.079 (125±2) 5.28 (134) 0.47 (12) 3.54 (90) 4.88 (124) 6.43 (163.4) Battery case resin: Standard (UL94HB) Color is black. ...

Page 53

... A or smaller 14.5V to 14.9V (per 12V cell 25˚C) VRLA BATTERIES PAGE 52 Terminal type: LC-XC1238AP: M5 threaded post 7.756±0.079 (197±2) 6.496±0.079 (165±2) 6.1 (155) 1.08 (27.5) 4.37 (111) 6.46 (164) 7.69 (195.2) Battery case resin: Standard (UL94HB) Color is black. ...

Page 54

... VALVE-REGULATED LEAD ACID BATTERIES: INDIVIDUAL DATA SHEET LC-X1242P/LC-X1242AP Photo/Label for reference only. (a) The photo and dimensions represent LC-X1242AP Specifications Nominal Voltage Rated Capacity (20 hour rate) Length Width Dimensions Height Total Height Approx. mass UL94HB M6 Bolt and Nut Standard Terminals and Resin ...

Page 55

... Discharge characteristics 77°F (25°C) 13.799 inches (350 mm) 13.5 6.535 inches (166 mm) 13.0 6.890 inches (175 mm) 12.5 12.0 6.890 inches (175 mm) 11.5 11.0 44.1 lbs. (20.0 kg) 10.5 10.0 LC-X1265P 9.5 LC-P1265P 9.0 8.5 8.0 Duration of discharge vs. Discharge current 65Ah 30 59Ah 53Ah 20 40Ah 15 26A 10 Approx ...

Page 56

... LC-XA12100P 8.0 LC-PA12100P Duration of discharge vs. Discharge current 30 100Ah 20 90Ah 15 90Ah 55Ah 10 40A 5 4 Approx. 4.5m 3 102% 2 100% 1 ...

Page 57

... VALVE-REGULATED LEAD ACID BATTERIES: INDIVIDUAL DATA SHEET UP-RW1220P1 Photo/Label for reference only. Specifications Nominal Voltage Nominal Capacity (watts/cell at 10 minute rate) Length Width Dimensions Height Total Height Approx. mass UL94HB Faston 250 Standard Terminals and Resin UL94V-0 Faston 250 Characteristics 30 minute rate ...

Page 58

... VALVE-REGULATED LEAD ACID BATTERIES: INDIVIDUAL DATA SHEET UP-RW1245P1 Photo/Label for reference only. Specifications Nominal Voltage Nominal Capacity (watts/cell at 10 minute rate) Length Width Dimensions Height Total Height Approx. mass Standard Terminals UL94HB Faston 250 and Resin Optional Terminals UL94V-0 Faston 250 and Resin Please contact Panasonic for availability on optional items ...

Page 59

... LC-PD1217P --- 1.0 --- LC-X1220P 5.0 ± 0.3 1.0 --- LC-X1220AP --- 1.7 --- LC-X1228P 8.0 ± 0.5 4.5 16.5 ± 1.5 LC-X1228AP --- 2.2 ± 1.0 9.8 ± 1.5 LC-R1233P 6.0 ± 0.5 --- 26.5 ± 1.5 LC-X1242P 8.0 ± 0.5 5.0 16.5 ± 1.5 ...

Page 60

... Do not incinerate. * Flush with water at once if contact is made with electrolyte (Acid). Matsushita Electric Industrial Co., Ltd. Made in China Sample of Flame Retardant Valve-Regulated Lead-Acid Battery Label Rechargeable Valve Regulated Lead-Acid Battery LC-P0612P FLAME RETARDANT Information specific Constant Voltage Charge to model Voltage regulation number Standby use : 6.8 -6.9V (25˚ ...

Page 61

... LEAD, for the collection and recycling of valve-regulated lead acid batteries (VRLA). Federal and State Requirements for Proper Disposal Federal and State laws prohibit the improper disposal of all lead acid batteries. The battery end users (owners) are responsible for their batteries from the date of purchase through their ultimate disposal. The only legally acceptable method of disposal of lead acid batteries is to recycle them at Resource Conservation and Recovery Act (RCRA) approved secondary lead smelter ...

Page 62

... Special Note to Consumer Users of Panasonic VRLA Batteries All Panasonic VRLA batteries are chemically identical to common automotive starter batteries and can be returned to any site that accepts automotive lead acid batteries for recycling. Examples include retailers of automotive batteries, automotive service centers, scrap metal dealers, etc. ...

Page 63

GLOSSARY OF TERMS FOR VALVE-REGULATED LEAD-ACID BATTERIES Glossary of main battery terms ABS RESIN A plastic material largely used for the case and cover of batteries. ABSORBENT GLASS MAT (AGM) A highly porous material, absorbent micro fiberglass-mat mixed with polymer ...

Page 64

GLOSSARY OF TERMS FOR VALVE-REGULATED LEAD-ACID BATTERIES - CONT. DISCHARGE RATE The term to express the magnitude of discharge current. When assuming discharge current and time to discharge cut-off voltage t hours, this discharge is called t hour rate (tHR) ...

Page 65

GLOSSARY OF TERMS FOR VALVE-REGULATED LEAD-ACID BATTERIES - CONT. NOMINAL VOLTAGE A nominal value to indicate the voltage of a cell battery. Generally, nominal voltage value of a battery is somewhat lower than its electromotive force. Nominal voltage of the ...

Page 66

... The valve also serves to prevent outside air from entering batteries. VALVE-REGULATED LEAD ACID (VRLA) Valve-regulated (sometimes referred to as sealed, although it is technically incorrect) lead-acid batteries operate with the principle of gas recombination and immobilized electrolyte. The gases that are produced during normal operation are recombined in the battery reducing water loss ...

Page 67

MEMO VRLA BATTERIES PAGE 66 AUGUST 2003 ...

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